Polypac Rod Seal for Excavator Cylinders

Polypac rod seals for excavator cylinders provide reliable, long-lasting hydraulic sealing. Engineered for abrasion resistance and harsh conditions, our seals are customizable and backed by advanced testing and materials expertise.

Get a free quote

Product Information

Polypac Rod Seal for Excavator Cylinders

Polypac rod seals are designed specifically for excavator hydraulic cylinders, delivering dependable sealing performance in demanding construction and mining environments. Built from proven materials and manufactured with strict quality control, these seals reduce leakage, extend cylinder life, and cut maintenance costs.

Why choose Polypac rod seals?

Durability: Made from wear-resistant materials, our rod seals withstand repeated motion and abrasive particles common in excavation work.
Reliable sealing: Precise molding and tight tolerances ensure consistent contact with the rod, preventing hydraulic fluid loss and contamination entry.
Wide material options: We offer seals in PTFE variants (bronze-, carbon-, graphite-, MoS₂-, glass-filled) and elastomers like NBR, FKM, silicone, EPDM, and FFKM to match your system needs.
Custom solutions: Polypac provides tailored designs for special working conditions, including high temperature, heavy contamination, and extreme pressure.

Technical strength and quality assurance

Founded in 2008, Polypac combines industry experience with advanced production and testing equipment. Our factory spans over 10,000 square meters with 8,000 square meters of production space. We collaborate with universities and research institutes to continuously improve materials and seal designs. Every rod seal undergoes rigorous inspection to meet strict performance standards.

Applications

Ideal for excavators and other heavy equipment, Polypac rod seals perform well in construction, mining, demolition, and earthmoving machines. They are suitable for both new builds and replacement parts, offering an easy upgrade path for improved reliability.

Easy ordering and support

Polypac supports flexible order quantities and provides technical guidance to select the right material and profile for your excavator cylinders. Our team helps with dimensions, installation tips, and testing results to ensure the best fit and function.

Choose Polypac rod seals for peace of mind: engineered reliability, strong material options, and proven manufacturing expertise. Contact us for sample requests or custom sealing solutions.

Picture Show

FAQ

What is the purpose of the metal spring in a rotary shaft seal?

The garter spring in a shaft seal (e.g., FSKR, SPGO types) provides a constant radial force on the sealing lip. This ensures consistent contact with the rotating shaft, compensating for minor wear, eccentricity, and vibration to prevent lubricant leakage.

When should I use a spring-energized seal instead of a standard elastomeric seal?

Consider a spring-energized seal (e.g., GSF, SPN types) for demanding applications involving: Extreme Temperatures (below -30°C or above +200°C) Aggressive Chemicals that elastomers can't handle Very Low Leakage or "Zero Leakage" requirements Poor Lubricity or dry running conditions The internal spring maintains constant sealing force, compensating for wear and system variables.

What is the difference between NBR and FKM materials?

NBR (Nitrile/Buna-N): A general-purpose, cost-effective material with excellent resistance to petroleum-based oils and fuels. It has a standard temperature range of -30°C to +100°C (-22°F to +212°F). FKM (Fluoroelastomer/Viton®): A premium material with excellent resistance to high temperatures (up to 200°C+), chemicals, and oils. It is used in more severe environments but is more expensive than NBR.

What is the difference between a static seal and a dynamic seal?

A Static Seal is used between two surfaces that do not move relative to each other (e.g., pipe flanges, end caps). O-rings and gaskets are common static seals. A Dynamic Seal is used between surfaces that do move (e.g., piston and cylinder, rotating shaft). Rod seals, piston seals, and rotary shaft seals are designed for this purpose.

If you have another questions, please feel free to contact us.

Leave a Message